The body is conductive. The (dry) skin has the highest resistance. Inside the body there is fairly low resistance due to the amount of (salty) fluids. However, as in all cases, the amount of voltage needed to produce a given current flow in any conductor (including the human body, through the dry skin) is given by Ohms law. With enough voltage, a current will flow. No cuts, punctures, Aztec rituals, or other silly suggestions are required.
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